CVE-2025-2857
Last modified
CVE-2025-2857 is a critical-severity vulnerability rated 10/10 on the CVSS scale. Following the recent Chrome sandbox escape (CVE-2025-2783), various Firefox developers identified a similar pattern in our IPC code. A compromised child process could cause the parent process to return an unintentionally powerful handle, leading to a sandbox escape. EPSS estimates a 1.89% chance of exploitation in the next 30 days.
Description
Following the recent Chrome sandbox escape (CVE-2025-2783), various Firefox developers identified a similar pattern in our IPC code. A compromised child process could cause the parent process to return an unintentionally powerful handle, leading to a sandbox escape. The original vulnerability was being exploited in the wild. *This only affects Firefox on Windows. Other operating systems are unaffected.*. This vulnerability was fixed in Firefox 136.0.4, Firefox ESR 128.8.1, and Firefox ESR 115.21.1.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 136.0.4 |
| Mozilla | Firefox | < 115.21.1 |
| Mozilla | Firefox | >= 128.1.0, < 128.8.1 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1956398Permissions Required
- https://issues.chromium.org/issues/405143032Permissions Required
- https://www.cve.org/CVERecord?id=CVE-2025-2783Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-19/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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